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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following*prw5b pfuza.a.e8(9ao ,rq chxq-h0 are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thaqm mz,l4a+ (rqgdqq f.abw n49/g9 my0t the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on ;lw4g w 9ed7xz6j)cm pthe induce9dmpx ) wz 7wje;c6g4ld $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strengt0de vr(aoj3 i.eo8 e7rh of the magnetic field through a loop of wire produces what kind of change on the inducoo d3e78.aeevij0(r red $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change2qx gf ;pnjf,jke4 0a- on the inducej p2k e 0q-4ff,ag;jnxd $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed fr4cz e).y2khn rom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inducgy c.u+ +kyr(8t qsvd,ed current in a conductor will be that which tends to produce which of the following effec++.sc 8tdgr(, ykuqvyts?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne4pm vf s+ q;kqp: du9p4 vl0z;dk+ae2/cbbmb0t is held above its center with its north pole pointing down. The stationary magnet ina dlz 40 /scm dkf2vvu+9;b + ;kqpb4q0:bpepmduces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies 12lav4w.6l y 9jmzcv1d 9cwzxflat on a horizontal table. A bar magnet is held above its center with its north pole pointing doww69 z 14vca9.mlvcjx2 zy1ldwn, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector v d75fnmlqmt7 o- 6c)ppoints straight up. The mapnm l)q7m6cd5o7-f tv gnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vecto t;0szd2szpl)r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this;s0t z)zs 2pld coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top i) f(.3 sd ug3g fmt3qsp-rt/jin a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed iuqg f-t33 dm.3fgtssr/(jp ) from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasinym -a-fhi3w,n g/6l zihecitp6/5ef 2 g current northward. Two coils of wire lie flat on the table, one on either side of the wire. When etif /l e/ y wph36g6c5,fn2m -zah-iiviewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enteriza6ll. r*koyxyt/5n ; ng first. As the north pole enters the wire, the induced current will be (as viewed 6 5x l. anozy;t/yk*rlfrom above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at cj(c8pd wx l7(ionstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field pointsilxwc(d p (7j8 straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is s1(v (;f czxfv,ji1 7gpiv b4frotated at constant angular speed about an axis whose direction can be varied. In a region whe zj41 i(s71,v(gfbx;ffc vpvi re a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.r eu-3e*xeha*se0 q,+zg5r:d7iy g pj
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an rwzm.k-l, d ; rr7nam-$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magne/5ud bx lh9b ca)f7b;otic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) i ;d: s8h+ ttc34ay3ulbd7kzvqs moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrl4hqauttdz3d b7y:v8 + c; s3koss the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal ba7bd h l3opk:a qo/2e.jr rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfb:w+jh7o+upl+ *ee/1vmaws4- r h teeorms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each secondbcq8/.1 nhieza1 (t je. The frequency of the(ezeh1 aj b1n8/q.t ic $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devb i )xube.vg6g 6c;dq,o6b+xv ice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device that v, )fc;*lsthc

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondabn yjwgn7xb n+/wb/de./j b, vsv5+o86 t9yn ary coil contains more loops than the primary coil then b/j ++ ngsxjnvn85dy 9/t nwveb ,.ab/w7boy6it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops thank1kn7ja 8ek3s o;zrj-d8p9h2/(gmn pi 4tbjn the secondary coil 3r npb -hs2eoz jn/;k49pk 7 n81dijkm(t8jga then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power -o.)gvv kg0 myinput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuim 7+e8b etgdlu- 2jn/yt,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in s/ar)h7 83 eovetc xs2peries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across theta v/ohp3x8rs7ce)2e resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectu pq(d an4ugc r*i-l3(ed in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vc(lgqpua3ir u -*4d(noltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecte7 2jqte* p3c4ug4hguhs l l8s3d to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with indu(f l- ub3tyjhh9qn )5hctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. bl.ach31yj 8p 8ebox 4The time constant for 4 1ye8oap. b jl8hbcx3the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The bsys: j x,j0i,3); swtah +jmheattery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curs x, s03;i, j+twjs):hhjemayrent to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same un*.:sucm()xduc i0bfm q1nu1((dhpc6( hnlx nits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this ciuw m zoa 5(rp),onz10xrcuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected t4ozbs(z+ 0nd)n r8iql;t ld1 dk+ eoj/o an AC power supply. In this circuit, the curren0k)( ozd s;8olz/j+b+trnq4n d led i1t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequ drnam 0x ;4yv4m8zt(ooxl /j5ency ( ln0arjxv4om/o48 tz5my; dx is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an7xfca , 5j0k*nai s ot7,jxru; inductor is doubled, the inductive reactansa,un0c;jrtoxf 7ki 7 *,a5j xce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the i25oxz+y mxz9p nducto9m2px5 +yzz xive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. bqwsmzaf t;ni ; p1.t6oic8+8In this circuit, the currei; q;w6i1.f t+ 8z atcop8nbmsnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the fr v:)shchkusf*-,z4g k equency is tr* k:g-cfs 4s)zhhkvu,ipled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capatvsx3n pi*7v:9n qe8t citor approaches zero, the capacitive reactance of that cai:9qv x8n*te7ts 3pv npacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betweenazl;3 tlvot14 the voltages of the inductor and capacitor in a RL1ta4otlz3; lvC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined a 0*kssknyxs,u 16q:kcs $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The imp2bc9jr) x ug8fedance of the circuit increases if R increases. When is this stf9)j2ucxg b8ratement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The-m1pzldpj9z os mz3(4 impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuibi9-a9fk bpv )t. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance b e555ff 6dyf2bl5x fnpoth double in an LRC series circuit, the repfffn 56xb55dly f25esonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that 1ph;c6- x llqh6c kfdn7z7f4s is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occur emoy xsoqe2(8t0m5 7 asrj/r+s when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20l/a 5v ) pmhp0mnw8lais42+bp T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are papm4 m)l+sl nwa5 802hvip ab/prallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m+ yjpn o 9zff/5l/5. cbpx1scj is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whepl 1cpjjc fbf/sn55y9 o.zx+/n the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20wsk (o as:lz33 T. Find the magnetic flux throuk(33:la sowsz gh the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduv( zso0,)2h9cu q jdslced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a co3r/a x ,,cpoyn8wj 6xtil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides x72wnhxpvmrs8* e*y( r)cnidk /7y )j18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced mdr yevhxs2j(8nwcxy*p /*7nr) )i k7$emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns az ;sjs1vl -r4ind an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns anbhy elsqbjfcoc).yw8 ,xm33g 92 i7/md area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a la75p q fg1by /vk5x.qyocation where the downward component of the Earth's magnetic field 5yq51 x agpqkvf.b7/y is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 mi) )ozrj6pzrd)3pn fa- 6hfi7q kt-(d long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetinaozfr )z 3-p)d)kf6it jp7riqhd -(6c field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has nq (54e6n oed3pwxzn)hzp/:u 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tu vh0nq0knb.9i75 w (r t;wlhizrns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatuky(,g 5 kchj77pnlp9ire. Each loop is 12 cm long and 8 cm wide. The armalkc,(j7hig n ypk5 p97ture rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire oab,fh xpd:z 51d5 5rwsf area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AClv sn ib:bf ey(sv:35r+wdo+4 generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available+f slrn5(o:3d+ieyb wv :vbs4 . If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wii5jr5o-bw1zz th a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The tod:/nxkx :eie +az5 b-:ruh5motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The m7 j r j0-hrlub e,3ggx2-ijm3dotor operates on 1i-dumre-70bglrgj h2xjj 3 ,3 20 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.yste*/vliwp 6 ll.-z ; The operating current is 1.0 A. What is the szep vlyl i.ls;*-/t6 wtart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is coy s*nsw 54e2nennected to a 24-V power supply. The operating current is 1.0 A atew4 2nyns5es* full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co. r+x(m9j l gz-qb,tmfnnected to a 24-V power supply. The operating current is 1.0 A at full sp ,jg9- .qmmz+ rtf(lxbeed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primrh+gqx z12w-u ary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transf kan5+s 1cytt8ormer causes 14 A to flow in the secondary. How many turns are i1k tnc58s+ayt n the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how mah6xfx+/t8rw(/ qomn jny turns are necessary in a 110-V primary if the 24-V secondary (o/ xm/x+86fjrtnqh w has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn seu74,)1wl j, z5 fmw lzwlcn(u7m i-ot/t/jir fcondary coil. If the current in the secondary l ,t/w1iwjrf7 -)5cu/ml(o, wj7nftzz mliu4 is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows inu;htc7u3jp6h r*bl0 l the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V cp3 u0c6ul hh7bl *tj;ran flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a(apk/ imk(w3d neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dramwkik/apd ((3 w?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on 3)agh jh )yzc5its primary coil and 300 turns on its secondahh g5c z3y))ajry coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turn( -vy/im;smjjdo/ dc1s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tycds vo;/ dm/j ji1(m-o the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.lg:ofc6q o mw0mh83b ; If the input current at the primary is 100 A,wgmo0mflbh:o8 q6; 3c we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary ho*hsba z -h(mw+ rk;9fas 200 turns. If the input voltage to the primary is 100 V, we can expsfo h h;a+-krb9wm( z*ect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tr1rk2 v, 6p3epz bmor)urns. If the power input to the primary is 121rb6ro pvk3z m)erp ,00 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currentk, d2 1n6+zcdfoapw;b0z e8jn at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find tze+0;n 8a zpcd1o6dj f,kb2wn he number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V.h7+b agr-9qh1 qbs 9nb The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lineq9 abh+s9 hgr b-b17qn of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 f1ht x+5pm(7s d( agzjV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltaxj g (f1 s+hza75mt(dpge is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanc/pjl(/ w. k hn3ggs,vme of 0.60 W. A generator produces 1wl,/ mgjk 3gv(nsh./p00 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance t3i/6 dbnh;kxof 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformerkdn6/ix; t 3hb with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. e c+ mekc,zfxg/,a)c1 How much less power would be lost if the power were trans, cek1+agx c e)/fcm,zmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440xe;577ks0ly,p. o(v gm f hkfg V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmisk hem0gkgyv7 .s lo7(xpff,;5sion is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ea q41mq++b g y*p8i5ncur6qj vnergy is stored in the coil'8 bvgpmn5+ j6i ryq uqc1*+4aqs magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and anx pvr9)j 0q7*t.pj u7axil ct8 18-H inductor. What is this circuit' 9pi. ctt8ujx)a qpj7rl*70xvs time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V?zz0m s/.gg 3o.gv3wucr c:fv,;nzs8i

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed in)9z qv3 ;9*tuitzdgffto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of th;sxauu. cr14:s0d nwxe lamp?cu a 0rssx.4d :nw;u1x

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power d o6r)dwn5zdr 3t+-eix 9l xp3supply. What is the peak current through the resisd63wd5e+3itxrrx dplz9)n- otor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is bde 5 0( c v*1+t/jhsyx.vwayjthe power dissipated in the w1jc 5a/dtybvy( jxh0.v+se* resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorm +zmjp.eo* jg egy+65 is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistoe* (l +6vqy4q ouy)hpzr is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through amt yy( v*:,kr 5mcsm;f 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.z96cjj 8 weweddm(c2-0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.5 s0pa :(wxlsj57 s6s(gm5wato0-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 1/te,0l)rzq g t4.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of ind9q3biy esgdndef gsk35aw *cz01p -5 (uctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequen d6q*nm8adxr+ cy of 20 kHz is app*dax d8 mnqr+6lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH cntkksb ; b19(doil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive r/aqt/o xfrn9t2l pd63eactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is ndhf*-niuy ec.f.xk5-3 hgi 7keeded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10- :bl;tl ats-:bmF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be qjxr9*r+ y v yt7poj/:100 Wtrqr/ 9j7*yo: ypv+j x?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.l yk vu1j7lu6u +gk;y+0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W res65g4+2 li3w w4cf l*m 8eiqhr8 wpzozzistance, 15.0 W inductwoqzg53 zr ceizf8l 2*w8liw+mh644 pive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-wzhe8-p c9v)jh9 hty2rce/3 ymF capacitor are connected in pcvc2wy e/8t9-yhj39h erzh)series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH c) mkuab5uz)di5y:r y3 ssl0ssn2tr35d),vk boil, and 1.0-mF capacitor are conn3)d0s sir5 :5bb tkylss ,m3knv5zuuy)2r da)ected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is (i u-n6w*qtdl, ilk + -ezrb4bconnected in series with a 20-mH inductor, what is the impedance at itn-*bibw+ k -(ll,6qr z4e du1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what ia(gtq:f t6 au(m fe8y 5bdy*:ps the phase angltutm*(y5ad:g py (q8 be6a:f fe at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH pw; /kefx)s 3ecoil and 1.0-mF capacitor for a total impedance of 100 W at 1503x)fepke ws/ ;0 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resisz*:+2glf kkmm 2 2c ./fif9*w ntnjjcptor and 15-mH coi jnn* *9+ct fgpkm.zc/jw2mli2 f:kf2 l to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz r0 -xh9yny w-09v hduifor a toy9xhi-n h d-w0vyu09rtal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW : jhmt*p)n0c6 7rbd;. skdiuv resistor at 1.0-MHz for a total:7pdrbusj;)h *k6 tdvn.m 0ic impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with peorad/y0k3a8( s, q 0hj-jsha 20-mF capacitor. What is the impedance a j(s3p 0ar d-s/jak08h,ehq yot 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series wpc u/krl4 1lgn9jui3t40 uro- ith a 10-mF capacitor at 1.0 kHz for a total impedan4o pugkcj4-0/3r 9 rll iuu1ntce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor sk/fk76 e0ghv.v fmc9-0 ffgvat 1.0 kHz for a phase hf6v-m / 7ekgck.f sv vf09fg0angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a toxtp ./dym0f( qx x*,,xs 1jrhztal impedance o/x0(ztxmfp,d1s,x yq*. r hxj f 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacih+h4b+n yxnu b ()3emvtor at 120 Hz. What is the phasbnh ++ey h 4mvxbn(3)ue angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows af/8wgbo,y5n c;xe ,m v6fe)y at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in cyo8 f6e;ab,5/vf )myewg xn ,series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacit5 l*4-rob ungn olb67:gg4jyru5( twjb , wvh4or, and a 0.350-H inductor. The circuit iw: vlb7*-4 n,g 4ngu(r6jo5trbujw 5o4lhgy bs connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactae460lv/mrjdc r ww mu;/,g ,yknce 30 W, and an inductor of induc 0l/4rg6cm ;m vdwe,,k/jyrw utive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contain1miy1vxf.b 6zing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when zx.b1fm6vi 1y connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessar4r64 w24hjnc0 -:av rgvt;gjwe fq* owy in series with a 500-W resistor for a phase angle of h;gvn:2-j 4a64*cw0og v qwfrwt4je r $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequehtwzm2:v l-yjv (7 xso3 l3ev5a*n iv3ncy should the circuit be driven in order to have maximum pow:z3vya 5 *- vtvwxm 3lsnveiojl2 7h3(er transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W b7mkcrt.n0l * /7db;+ . zmg4 6piops6pd axjoresistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuitog67 op +bi tak4lz.6jbxm; r.d*0pc/psmnd7 is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuis )t e/zllx50dt is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impeda bk- 6c5o9))dnkfw ibqnce of 60 W and a resistance of 30 W. What is the poweid5)6)fk nqkb 9wbco-r factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor f-q4qx 0r3,i9uwjg r czyk97fb or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conner g9wqi-3k0479qjb zrf , cyxucted to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitorhngcrz r/hs*yp .*/)r and a 15-mH coil in series?zrrhp* r/c. * yhg/s)n

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor d m*1mm4sa x5qboro:r.;v :gxfor a resonant frequency o;qr1ox*mdx .gbmormva : s54: f 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3 v)xau-:pro/ j.7-mH inductor for a resonant frequency of 100/a o)v-j prux:0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in seg6hf sp654ja( iswbv+ries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit awbhg6j+vspf i6 5(4 sis to be 1000 Hz?

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